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PROCEEDINGS OF THE NATIONAL MUSEUM 



1947, referred A. gorgonensis to A. rigida. The tubercles on the cirri 

 of A. gracilis, mentioned and figured by Hessle, appear to be internal 

 structures and not external papillae as in some other pilargids. The 

 presence or absence of shorter neuropodial forked setae is not a good 

 character, since the forked setae appear to be formed by fracture and 

 splitting of the longer neurosetae; thus they are variable in occurrence 

 and appearance. 



Figure 19. — Synelmis albini (from specimen from Antigua): a, dorsolateral view anterior 

 end, with proboscis partially extended; b, lateral view segments 49-50; c, outline of cross 

 section in region of setiger SO; d, parapodium from same, the thick cuticle shown. 



Material examined: Holotype and paratype of Synelmis simplex 

 Chamberlin, Tuamotu Islands, South Pacific, USNM 194S0, 19481. 

 Saipan, Marshall Islands, Central Pacific. Ft. Barclay, English 

 Harbor, Antigua, Barbados-Antigua Expedition, 1918. Dry Tortu- 

 gas, FL, 1914 (AMNH). Old Tampa Bay, Fla., January 1959, M. L. 

 Jones (4 small spec; AMNH). 



Description: Length to 60 mm., width to 1.5 mm., segments to 170. 

 Body elongate, subcylindrical, tapered posteriorly, segmental grooves 

 indistinct anterodorsally, with parapodia distinctly set off from body, 

 having general aspect of a goniadid (may have distinct midventral and 

 dorsolateral grooves when preserved, as in some opheliids, fig. 19c). 

 Prostomium with pair of biarticulate palps sometimes turned ven- 



